Pacemaker of Heart
Trending Questions
Q.
Sino-atrial node is called the pacemaker of our heart. Why?
Q.
Why do we call our heart myogenic?
Q.
What is the most important brain or heart?
Q. The correct route through which pulse-making impulse travels in the heart is:
- SA node → Purkinje fibres → bundle of His → AV node → heart muscles
- AV node → bundle of His → SA node →Purkinje fibres → heart muscles
- AV node → SA node → Purkinje fibres →bundle of His → heart muscles
- SA node → AV node → bundle of His →Purkinje fibres → heart muscles
Q. Which of the following statements define a myogenic heart?
- A heart with 4 chambers is called a myogenic heart.
- A heart in which the blood circulates twice is called a myogenic heart.
- A heart that does not require neural input to beat is called a myogenic heart.
- A heart that requires neural input to beat is called a myogenic heart.
Q. Which of the following is called the pacemaker of the heart?
- Sinoatrial node
- Atrioventricular node
- Purkinje fibres
- Bundle of His
Q. Artificial pacemaker is used to replace
- AVN
- Purkinje fibres
- SAN
- Bundle of His
Q. The first heart sound (lub) is associated with:
- Closure of bicuspid and aortic valves.
- Opening of the tricuspid and bicuspid valves.
- Closure of the tricuspid and bicuspid valves.
- Opening of pulmonary and tricuspid valves
Q. Choose the incorrect statement with respect to breathing and respiration in humans:
- The volume of the thoracic chamber increases due to the contraction of diaphragm and external inter-costal muscles.
- O2 and CO2 transports in the blood majorly through RBCs and as bicarbonate, respectively.
- High pO2, low pCO2, lesser H+ concentration and lower temperature promotes formation of oxyhaemoglobin.
- CO2 and H+ concentration is insignificant and oxygen plays a huge role in the regulation of respiratory rhythm.